Wyoming Gas Prices Rise This Week, How High Can They Go? Gas prices in Wyoming are on the rise once again. As of Friday (July 16th), the statewide average per gallon for regular is up to $3.43. This, according to AAA. At about the midpoint for summer, how much higher can gas prices go before we hit fall? The $3.43 statewide average is up 6 cents per gallon from where it was just a week ago and 28 cents higher from where it was a month ago ($3.15). According to Gas Buddy, the cheapest gas in the entire state is in Laramie at the Tumbleweed Express at $2.85 per gallon. The highest was reported yesterday in Teton County at $4.19 per gallon.